Find the midpoint of a(5,3) and b(3,-5). place your answer in (x, y) notation with no spaces.

Midpoint means 1/2 way 
separate the x's and the y's find the middle of the x length, middle of the y length 
 x: 5 - 3 = 2    1/2 of 2 = 1   from either end  (3 + 1) or (5-1) = 4 
y: 3-(-5) = 8     1/2 of 8 = 4   from either end  (3-4) or (-5 +4) = -1 

midpoint is therefore (4, -1)